Olympus E-M1 III vs Sony A7S

Its time to look a little more in depth at the Olympus E-M1 III vs Sony A7S, both Pro Mirrorless cameras by brands Olympus and Sony. There is a significant difference among the sensor resolutions of the E-M1 III (20MP) and A7S (12MP) and the E-M1 III (Four Thirds) and A7S (Full frame) boast different sensor sizing.

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The E-M1 III was manufactured 5 years after the A7S which is a fairly sizable gap as far as camera tech is concerned. Each of these cameras feature the same body design (SLR-style mirrorless).

Before going right into a complete comparison, here is a quick summation of how the E-M1 III scores against the A7S with respect to portability, imaging, features and an overall mark.

Below is a sample of the gallery pics for Olympus OM-D E-M1 Mark III and Sony Alpha A7S. The entire galleries are available at Olympus E-M1 III Gallery and Sony A7S Gallery.

For anybody who is planning to travel with your camera often, you'll have to consider its weight and volume. The Olympus E-M1 III features exterior dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") having a weight of 580 grams (1.28 lbs) and the Sony A7S has sizing of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") accompanied by a weight of 489 grams (1.08 lbs).

Contrast the Olympus E-M1 III vs Sony A7S in the new Camera with Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will vary dependant on the lens you select during that time. Here is a front view dimension comparison of the E-M1 III vs the A7S.

Taking into consideration size and weight, the portability grade of the E-M1 III and A7S is 67 and 77 respectively.

In many cases, it is hard to imagine the gap in sensor dimensions only by checking out specifications. The picture here should provide you a stronger sense of the sensor dimensions in the E-M1 III and A7S.

Plainly, each of the cameras feature different megapixels and different sensor dimensions. The E-M1 III due to its smaller sensor is going to make getting shallow DOF harder and the Olympus E-M1 III will produce greater detail due to its extra 8 Megapixels. Greater resolution will also allow you to crop photos way more aggressively. The younger E-M1 III provides an advantage when it comes to sensor technology.